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| author | Andi Kleen | 2006-01-11 22:45:24 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2006-01-12 04:04:58 +0100 |
| commit | c818a18146997d1356a4840b0c01f1168c16c8a4 (patch) | |
| tree | 8d7e049742e87666bf3089fe46e04828b6417fd7 /arch/x86_64/kernel/setup.c | |
| parent | [PATCH] x86_64: Support alternative() in vsyscalls (diff) | |
| download | kernel-qcow2-linux-c818a18146997d1356a4840b0c01f1168c16c8a4.tar.gz kernel-qcow2-linux-c818a18146997d1356a4840b0c01f1168c16c8a4.tar.xz kernel-qcow2-linux-c818a18146997d1356a4840b0c01f1168c16c8a4.zip | |
[PATCH] x86_64: On Intel CPUs don't do an additional CPU sync before RDTSC
RDTSC serialization using cpuid is not needed for Intel platforms.
This increases gettimeofday performance.
Cc: vojtech@suse.cz
Cc: rohit.seth@intel.com
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/kernel/setup.c')
| -rw-r--r-- | arch/x86_64/kernel/setup.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/setup.c b/arch/x86_64/kernel/setup.c index 8090a0a46882..46bf556efc30 100644 --- a/arch/x86_64/kernel/setup.c +++ b/arch/x86_64/kernel/setup.c @@ -1042,6 +1042,7 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c) if ((c->x86 == 0xf && c->x86_model >= 0x03) || (c->x86 == 0x6 && c->x86_model >= 0x0e)) set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability); + set_bit(X86_FEATURE_SYNC_RDTSC, &c->x86_capability); c->x86_max_cores = intel_num_cpu_cores(c); srat_detect_node(); |